Coffee grinding machine



Aug- 15, 1950 s. E. RlcHEsoN y 2,519,198

COFFEE GRINDING MACHINE Filed Nov, 18, 1944 2 Sheets-Sheet 1 Aug. 15, 1950 Filed Nov. 18, 1944 s. E. RlcHEsoN 2,519,198

COFFEE GRINDING MACHINE 2 Sheecs-Sheeiii 2 FI Gr.36.

20 SA /Vf-oeo ER/CHES o/v INVENTOR ATTORN EY Patented Aug. 15, '1950 isTAr-Es PATENT f oki? Fien z npplicatonnovener 1s, wir, seriamo. 56451073 ceram (onzer-rea VMyinvention relates to ccfFee'- grind'ifngimaelrnesf and?has-`particular`reerence te#machines operatediti-wa motor. Y

@ne oftlierobjeotsiof my'imrentiin-i'si to pro'- aiy coffee` grifrid-rrgmachine iitifwliichftlii'e ooifee'beans, are lground by teeth "inaclearance kformedibetween a" ribfledfrotcronl thej motor shaft and a grooved bloci'csupportedabovethe' rotor, meansbeingprovided foi-'adj usting thecl'earance Another iob'j'eot` of'my'finve'ntiorr .provide a coffee V'grinding map'flfiiineL Vcfjanj attractive and compact appearance,A which wilt' be inexpensive tbbuil. and easy' to operate.' i lts/I5); 'invention .is more lfullydescr'bed' in 'the acnmpanying .specification and" `drawings in which:` f

Eig.. 1. is. a. sectional elevational view' of my Vcoffeegrinding maciiinel.`` y

atop planv` View ofthe same partTyjih section; AVf` Eigs.13a.,Sb-and-Scareside views of the block casing "(see from the Teftsi'de of Fig. 1 after removal of ther` housing Yand taken on the section line shown Fig. 1f-)v showing? the adjustment means `tot theblock orf stator.` in: dilerentpositions of adjustment. and yg, Y

Fig; 4 islam-elevational.. view otmymachine on a reduced scale,Y showing manual adjustment for regulating the neness ofthe grind. i

resistance-to the rotation ofI the rotor increases considerably abcveftheiiinormal'as; for instance, if a foreign particle shouldhap-pen to be Withthe coeetbeans.

anagrams-fs proviuecrwuu'setera1 @mmm from "an annularshli' I'Tt'oward 'the centerofthe rotor. Grooves I3 are cut in the shoulders, forming teeth I4.

A casing I5 is supported on the plate and isv removably held in place by studs I6 with wing nuts I1. The casing is provided with a tubular extension 20 on top in which slides an upper cylindrical portion of a block or stator 2|. The block has a shelf 22 at the bottom opposite the block shelf I2 and a plurality of annular recesses,

forming ribs or shoulders Ef V@veci/fes'24""are-'cut :the soudfers'fbrming teeth? 251 Th'vertical `and@ihorizontal-sdes of the shoulder correspond toi-the similarl siiesf cf the rotor shoulders, form"- elearaneesf Whitt.: :decrease Aircrrr. the top to the bottom. Tfiegvupperrnost clearance sum-@tenus 'wide ftd-f admit feofre bea-ns, andthe clearances gradually decrease until at venyA ine clearance isfobtaihedbetween the shelves Jef-fthe rotor and casing. "The shelf I'Zlis provided?V with arcuate grooves l2.17.1,"entendi-ng ifn generally'radialg directions and terminating at a short distance f-rornther periphery of the rotor; ySimilar grooves 21' are provided 'in the shelf'v 22 ofthe-'block 2I. 'i

The upper portionA of the block or stator 211 is'fprovided with a-'fun'nelf 28; forminga continuatiorr-of a hopper 29S for" coffee beans`supported topof the housing I andv coveredV on top a 11d au. The housing and the hopper witngit's lid mayA be` preferably" made of angrnarnental shapev as shown in Fig. 4". Theblockis supported in 'the casing by a" shaft or `roelV 3l),I passing timmgnr the sides of the lbreek 'without 'ciearance andial'softhrougnslots s2 in tne'tubuiar extension Zircjcasingj I5 and openings in the ight'hand Wall-cffifarne or *housingV li Shaft 3i vsupports eccentrics 33j each 'engaging the respective slot-32. PisA can best be' seen; on Figs'. 3a. Shand Scg's'iots'have areetangular shape extending, in

circumfererrtial direction.; liccjentrics"'$3 are so dimensif'onedf that they just fill thes'l'ot's inv vertical direction and': can b e rotated' Within the slotsjby rreason of' the' circumferential extensionfthereoff l TheopeningsV inV the walls. of housing "I -have just'suflicient'clearance top'ermita slight vertical movement of shaft 3 I relative to; housing-v I; and Vextension" 2:01 willgbe apparent, rota-Q tion' ofshaft 3Ifirrur 1ison jwijth eccentrics 33, will i cause a v correspending.slight lifting jor lowering of" shaft .relative tot casing, extension `201 and, hencegfalso 0I. statorgjZII relative. tofjrot'or ,6 1 It 'WHT 'further be' apparent", thatl epilee (Will"'be ground. iinest when the statoris closest' to .the

from tue rotar. Figs. r anu'zshow biek'or' stator 2| in a position for medium ne grinding.

Fig. 3a shows the eccentrics in a position for fine grinding; Fig. 3c in the off position; and

Fig. 3b in a position for coarse grinding. The end of the shaft 3I extends outside the housing I and is provided with a handle 35 for its manual rotation. The handle is provided with a sliding pin 36 having a thumb head 31 and a spring 38, urging the pin to the left and, into engagement with holes 39 in a plate 40 on the frame 2. Different holes correspond to the different neness of the coffee grind. Fig. 4 shows handle 35 in a position for medium fine grinding corresponding to the handle position of Fig. 1. The right hand limit position of the handle is marked as off position. Accordingly, the left hand limit position of the handle is marked ne grinding positionand the intermediate position next to the said position is marked coarse grinding position. The other intermediate positions may be visualized as producing a medium iine grind.

The rotor 6 is provided at the periphery with radial vanes 4|, functioning as a fan or blower when the rotor is operated, for creating suctionin the clearances and drawing the ground coffee Cil therefrom into an annular chamber 42 formed V under the casing l5. A spout 43 extends from the casing to the outside of the housing for discharging the ground coffee. Y

` Ay mercury switch 45 of conventional design and therefore diametrically shown is secured to the end of the shaft 3l by means of an arm 3| and is so adjusted that it will turn in unison with shaft 3| and disconnect the motor when-the handle 35 is turned into the position corresponding to Fig. 3c and indicated in Fig. 4 as right hand limit position. 'Ihe switch will close the motor circuit as soon as the pin 36 is placed in the first operating position or hole 39, in which position of the shaft and cam the clearances are the largest for producing the coarsest grind. The motor therefor can be easily started, the frictional resistance being the lowest.. This arrangement has an added advantage in that-the operator must question as to the kind of grind wanted because to start the motor he Vmust operate the same handle which controls the coarseness of the grind. A

l What is claimed as new and desired to be lsecured by Letters Patent is: Y v y 1. A coffee grinding machine comprising a frame, a vertical motor in the frame with a shaft extending above the frame; a rotor-.mounted at the .end of the motor shaft, the rotor having a substantially horizontal annular shelf portion at its periphery and a raised central position, ribs formed on the central portion; a tubular casing on the top of the frame having a substantially cylindrical upper portion; a cylindrical block slidably supported in the cylindrical portion of the casing, the block having a plurality of grooves corresponding to the ribs of the rotor and forming annular clearances with the ,rotor of progressively decreasing width toward thev peripheral shelf portion of the rotor, the lower Yportion of the block having an approximately,horizontal shelf above the rotor shelf, the lower shelvesA of the block and of the rotor having grooves facing each other and extending in approximately radial direction, said grooves terminating at a distance from the periphery of the vblock and the rotor respectively. v n

2. A coffee grinding machine comprising, a frame; a vertical motor in the frame', havingha shaft extending on top of the motor; a rotor on the shaft having a plurality of ribs; a casing supported on top of the frame forming a chamber around the rotor and having an upper cylindrical portion; a cylindrical block slidably i'ltted in the cylindrical portion having ribs cooperating with the rotor ribs; a horizontal shaft passing through the block and through the cylindrical casing portion; eccentrics on the shaft engaging enlarged holes in the tubular casing portions; and a handle for rotating the shaft in unison with the eccentrics thereby varying the vertical position of the block relative to the rotor.

3. A coffee grinding machine comprising a frame; a vertical motor in the frame having a shaft extending on top of the motor; a rotor on the shaft having a plurality of ribs; a casing supported on top of the frame forming a chamber around the rotor and having an upper cylindrical portion; a cylindrical block slidably fitted in the .cylindrical portion. and having ribs cooperating with the rotor ribs, a horizontal shaft supporting the block and extending at both sides thereof, said shaft ends being passed through vcorresponding holes in said cylindrical casing portion and said frame; an eccentric mounted on each shaft end for rotation in unison with the shaft, each eccentric being positioned to engage the corresponding hole in the cylindrical casing portion,-s'aid casing holes being circumferentially extended andarranged to permitrotation of the eccentrices therein, and said frame holes being shaped to permit a slight vertical displacement of the shaft relative to the frame and the cylindrical casing portion; and a `handle for rotating the shaft in unison with the eccentrics, Ythereby varying the vertical position of the block relativeto the rotor.

' 4. A- coffee' grinding machine as described in claim 3, in combination with a member having spaced detents therein to detain said handle in selected angular positions.

SANFORD E. RICHESON.

REFERENCES CITED- The following references are of record in the iile of this patent: v

y UNITED STATES PATENTS Number4 Name Y Date 24,058 Russell May 17, 1859 104,537 Baker June 2l, 1870 110,397 Rusk Dec. 20, 1870 237,320- Raymond Feb. 1, 1881 249,106 Schneider Nov. 1, 1881 250,432 lForster Dec. 6, 1881 955,463 Jones Apr. 19, 1910 1,502,675 Johnston July 29, 1924 1,987,941 4 Mathews Jan. 15, 1935 2,133,756A Rodgers Oct. 18, 1938 FOREIGN PATENTS Number Country Date 788,852 VFrance Aug. 5, 1935 20,279 Germany j A Novf30, 1882 y 110,983

Switzerland Nov. ,16,1925 

